Electric mining-machine



(No Model.) 2 Sheets-Sheet 1. E. 0. MORGAN. ELECTRIC MINING MACHINE.

No. 536,438. Patented Mar. 26, 1895.

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2 Sheets-Sheet 2.

(No Model.)

B. C. MORGAN. ELEGTRIG- MINING MACHINE.

Patented Mar. 26, 1895.

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UNITED ST TES PATENT QFFICE.

EDMUND O. MORGAN, OF CHICAGO, ILLINOIS.

ELECTRIC MINING- MACHINE.

SPECIFICATION forming part of Letters Patent No. 536,438, dated March26, 1895,

A Application filed July 18,1894. $erial No. 517,872- (No model.)

To all whom it may concern:

Be it known that I, EDMUND O. MORGAN, a citizen of the United States,residing at Chi cago, in the county of Cook and State of Illinois, haveinvented new and useful Improve ments in Electric Mining-Machines, ofwhich the following is a specification.

This invention relates to improvements in electric mining machines, andits object is to strengthen and render more durable and etficient suchmachines.

The invention consists substantially in the construction illustrated inthe accompanying drawings, setforth in the subjoined description, andmore particularly pointed out in the claims. Y

Like letters refer to the same parts in the several figures ofthedrawings, in which Figure 1 illustrates a plan view of the machine.Fig. 2 illustrates a side elevation in detail of the'tool holdingplunger and frame, and'tool in position. Fig. 7 is a vertical section ofthe same. Fig. 3 is a detail view of the devices for adjusting theplunger spring. Fig. 4 is a central vertical section of the machine. camdevices.

same. 7

In the operation of machines for mining coal and other substances thecontinuous impact of the mining tool against the substance to be minedproduces constant jarring and Fig. 6 is a side elevation of the greatstrain, so that the parts are rendered brittle and liable to break, and,if they are keyed together, rapidly wear loose.

It is one aim of the present improvement to dispense with as many jointsas possible and cast in one piece as many of the parts as ispracticable.

The main frame which incloses the motor, including the magnet andarmature, is designated by the letter A and need not be speciallydescribed, for it is of any suitable construction. It is provided withthe usual handles B and supported upon wheels 0, O. The motor ispreferably of the bi-polar form, with a single magnet D, having itssalient pole, E, in front of it at one side of the armature, and itsconsequent pole constituted by the frame at the other side of sucharmature. The armature is designated by the letter F, and is preferably,though not necessarily, of the port the machine. mechanism the machineis balanced on the axle joining the wheels, and the spur gear,

Fig. 5 is a top view in detail of the form shown and described in anapplication for a patent filed July 18, 1894, Serial No. 517,874. Thelower portion of the shaft of such armature is cast integrally with apinion G, which meshes with and drives aspur wheel H, the axis of whichis perpendicular to and in a line connecting the wheels which sup- Bythis arrangement of although quite large, nevertheless permitsconstruction of a comparativelynarrow machine, for the reason that saidspur gear may on each side revolve partly within the-space inclosed bythe periphery of the supporting wheels. The spur wheel H, has a hubwhich journals upon a shaft I, which latter extends above and below suchwheel. The upper end of the shaft I has a bearing in the bushinginclosed in the cylindrical bore of the bracket K, extending from themain frame; and the lower end of said shaft is cast in one'piece with acam L and with thesuperposed bufier plate M, and at the point ofconjunction with this latter is enlarged and beveledso as to form abearing in thebushing placed in journal box N, extending from the toolframe 0, the shaft then again being reduced and passing through thebushing-into the cam, of

which latter it also forms an'integral part.

The bufier plate or holder plate M is composed of two arms, extendingrigidly from the shaft on opposite sides thereof and terminating in opensockets M. open sockets are placed two rubber buifers, facing inopposite directions, and confined therein by top plates P, whichcomplete the socket, and may be secured to the other portion of suchsocketby bolts, or in any other .suitable manner. These rubber buffersare designated by the letter R. In the horizontal web-of the spur gear Hare formed, oneach side of the shaft, openings'through such web, withthe metal turned down so as to constitute abutments. These openings andabutments are designated in the drawings by the letter S.

enough to allow a certain movement before the buffers are engaged by thewalls or abutments in the opening. The motor drives the pinion G, andthe latter meshing with the In each of these The buifers pass partiallythrough -these openings, but said openings are large spur gear H rotatesit, and causes its walls or abutments to contact with a pair of buffersdiagonally arranged on opposite sides of the cam shaft and therebyimpart rotation to such shaft and give the throw to the cam. hen thegearing is moved in one direction one set of buffers is engaged, andwhen the gearing is moved in the opposite direction the other set ofbuffers is engaged, the set engaged always comprising two arranged onopposite sides of the shaft, and facing oppositely to each other.

The cam L, before alluded to is castin one piece with its shaft, isformed so that its active, operating cam surface extends from its centerto its point,its shape being best shown by dotted lines in Fig. 5, andits shaft being enlarged at the point of connection with the top of thecam into a circular projection or flange L of sufficient surface toafford a strong connection and at the same time rest above the top ofthe cam a distance adequate to allow the play of the anti-frictionroller against which such cam acts in operating the plunger and tool.Fig. 6 best illustrates how the projection is cut away on its under sideto permit the play of the roller. This anti-friction roller, which isdesignated by the letter T, is journaled in a bracket formed at theinner end of the tool actuating plunger U, which, at the outer end, hasthe tool Vsecured thereto. The tool holding plunger has the usual spiralspring W, which bears at one end against the end of said plunger and atthe other end against a nutX mounted upon ascrew-threaded rod Z, whichlatter has near its inner end a spur gear A, and is journaled in thebracket depending from the frame 0, in which the tool holding plungerplays. The nut X is kept from revolving by any suitable means such as apin guided longitudinally in a slot, as shown in Fig. 4 of the drawings.Revolution may be given the screw and the nut advanced or retracted tocompress or loosen the spring by means of the pinion B, mounted upon theend of a rod 0, which extends rearwardly to the back of the machine inposition to have its handle D grasped by the operator of the machine. Adetail of this mechanism is shown in Fig. 3 of the drawings and theposition of the parts and extension of the rod and handle thereof arebest shown by the dotted line in Fig. 1 of the drawings. It will beunderstood that the tension of the spring controls the force of the blowimparted by the pick or tool V, and that it is often important toregulate this tension without delay when the material being operatedupon is found to vary in density, and the mechanism just describedaffords facilities for such regulation without removing any of theparts; and, indeed, this tension may be thus regulated without stoppingthe ma chine, although the machine would probably be preferably stoppedfor a moment for the purpose. The supplemental frame which incloses theplunger and cam for operating the.

readily put in place, or as easily removed and replaced when desired.

It will be understood that by reason of the fact that the cam and bufferplates are formed in one piece with the shaft that there is no danger oftheir working apart by wear and the severe jarring to which they aresubjected; and the same is true with reference to the shaft of the motorand the pinions which it operates.

In practice, if the motor is positively connected to the mechanism whichdirectly operates the pick or tool, said motor is subjected to muchjarring, and this is found to afiect it most injuriously, andaccordingly, in the present instance, the gear which is driven by suchmotor is provided with slots, the inner walls of which may be broughtinto engagement with the buffers when it is desired to drive the pick,and by reason of this loose form of connection much of the jarringoccasioned by the blow is lost or overcome before it reaches the motor.

It is manifest that many variations may be made in the details of theconstruction hereinbefore set forth without departing from the principleof the invention, and I therefore do not wish to be understood aslimiting myself to the exact construction specified.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is-

1. In an electric mining machine, an electric motor, a mining tool,gearing interposed between such motor and mining tool, included in whichgearing is a wheel having openings in the web thereof and a shaft havingwings carrying holders for rubber bufiers adapted to engage the walls ofthe openings in the gear, and a cam secured to the same shaft, and saidwings and cam both being formed integrally with the shaft; substantiallyas and for the purpose set forth.

2. The combination with a cam having its active driving surface extendedfrom the axial line of the shaft to a point on its periphery and abracing flange projecting therefrom, and extending partly over andbeyond the active surface of such cam and affording the connecting basefor theshaft, of a plunger having a roller adapted to be engaged by thecam and to pass under the bracing flange in its travel; substantially asand for the purpose set forth.

3. The combination of a mining tool, a hollow plunger carrying suchtool, a spring inclosed within the plunger and bearing at one endagainst the end next the tool, an adjustable collar afiording a bearingfor the other end of the spring, a screw threaded rod carrying thecollar and having a gear thereon, an additional rod having a pinion atone end to engage the gear on the rod and extending to the outside ofthe machine and provided with a handle accessible to the operator;substantially as and for the purpose set forth.

4. In a mining machine the combination of an electric motor, a gearoperated thereby by intermediate connections, having apertures formed inits web on opposite sides of its shaft, a shaft loosely journaled in thehub of such gear, wings secured to such shaft carrying buffersprojecting within the openings in such gear and adapted to be operatedby the walls thereof, a cam secured to the lower end of the same shaft,a plunger operated in one direction by such cam and in the otherdirection by a spring, and a mining tool secured to the plunger;substantially as shown and described.

5. In a mining machine the combination of an electric motor, a piniondriven thereby arranged upon one side of the axle of the machine, amining tool, plunger and spring arranged upon the other side of the axleof the machine, a connecting driving gear mounted upon a vertical shaftin the same vertical plane with the axle and having-its peripheryextended partly within the vertical plane of the wheels on the machine,whereby the machine is balanced upon said axle, and space is economized;substantially as and for the purposeset forth.

In witness whereof I have hereunto set my hand this 12th day ofJune,1894.

EDMUND O. MORGAN. Witnesses: I Y FRANK T. BROWN, M. I. CAVANAGH.

